RE: Scale pattern plane?
World Models made( may still make) an arf of the Goldberg Chippy. Goldberg had an Extra that was also a great flyer but you would have to build that one! Chippy is a great flying plane but has a bit of dihedral. The Extra, not so much dihedral but I am sure it wouldnt be classic pattern legal whereas the Chippy might. Would do all of the pattern maeuvers well. Would have to ask the people in the know about it being an approved design for SPA but you might not care so much about that as flight charachteristics.